var addToArrayForm = function(A, K) {
    const res = []
    let i = A.length - 1, carry = 0
    while (i >=0 || K != 0) {
        const x = i >= 0 ? A[i] : 0
        const y = K != 0 ? K % 10 : 0

        const sum = x + y + carry
        res.push(sum % 10)
        carry = Math.floor(sum / 10)

        i--
        K = Math.floor(K / 10)
    }
    if (carry) res.push(carry)
    return res.reverse()
};